Riveting mechanism



E. I. DODDS. RIVETING MECHANISM. APPLICATION FILED JULY 21, 1920.

Patented Nov. 21, 1922.

INVENTOR s w m 0 H A ETHAN I. DODDS, 0F PITTSBURGH,

PENNSYLVANIA, ASSIGNOR T0 PLANNER! BOLT UOMPANY, OF PITTSBURGH, PENNSYLVANIA.

RIVETING MEGHAN'ISM.

Application filed July 21, 1920. Serial No. 397,918.

To all whom it may concern Be it known that I, ETHAN 1. Boots, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Riveting Mechanism; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in riveting mechanismv and more particularly to means for facilitating the backing-up of a rivet while the latter is being upsetone object of the invention being to provide a structure which may be attached to and be supported by a boiler sheet or other sheet through which the rivet passes and afiord a suitable abutment for one end of a rivet while the other end thereof is being upset, and thus to obviate the use of a backing-up bar held and supported solely by a helper.

A further object is to so construct the device that the same may be quickly applied to or removed from a boiler sheet or other sheet to be riveted and so that it will conform itself approximately to irregularities or curvature of the sheet.

With these and other objects in view, the invention consists in certain novel features of construction and combinations of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view of a structure embodying my invention. Fig. 2 is a sectional view. Fig. 3 is a transverse section of the core of the magnet, and Fig. 1 is a view of a modification.

In the drawings 1 have illustrated the application of my invention for backing-up the rivet passing through the overlapping sheets 1-2 of a boiler, said rivet being ind cated at 3.

4: represents an annular frame which may be constructed of magnetic material such as iron and contains a coil 5, the terminals of which may be connected, through the medium of a switch 6 located on the frame, in an electric circuit illustrated diagrammatically at 7. A magnet core 8 is movable within the annular magnet frame 4: and comprises a plurality of sections 8*, said core sections being movable relatively to each other so that the core may conform itself to the contour of the sheet 1 on which the device may be located. Outward movement of the core 8 is limited by the engagement of shoulders 9 on the respective core sec tions with an annular shoulder 10 within the frame 4:.

The frame l is provided with a plurality of pairs of lugs 11 between which L-shaped arms 12 are pivotally connected. The longer members of these arms are disposed approximately parallel with the magnet frame and are intended to engage the sheet at various points around said magnet frame. Thus it will be seen that the device has mag netic connection with the boiler sheet at its center through the medium of the core 8 and also at various points around the magnet frame so that the structure may be firmly magnetically connected with the sheet 1.

The interior of the frame 4 is threaded at its outer end to receive a cap 13 from which a post 1 1 projects. The short arm 15 of a hand-lever 16 is loosely mounted on the post 14 and provided in its outer face with a concaved recess 17 in which a convex ring 18 is seated,said ring being mounted on the post 145. A cap 19 is secured on the post 14: and encloses a spring 20, the outer end of which bears against the cap and the inner end against the ring 18. The lever 16 is thus loosely and pivotally connected with the mag netic frame and said lever is provided a comparatively short distance from its pivoted end, with an arm 21 having a socket in its free end and in this socket the shank 22 of an abutment member 23 is secured.

The structure will be placed against the sheet so that the abutment member 23 may be brought into engagement with the end of the rivet 3 and the circuit of the magnet coil 5 may then be closed, with the use of the switch 6, thus effecting a rigid magnetic connection of the structure with the sheet 1. The lever 16 may be made of consider able length and the helper will hold the same in such manner as to retain the abuts ment member 23 in proper relation to the rivet and while the other end of the rivet is being upset with the use of a suitable upsetting tool, much of the end thrust incident to the operation of such a tool will be taken up by the spring 20 to such an extent as to relieve the burden of the helper in holding the lever 16 in position. When the upsetting operation shall have been completed, the device may be readily detached from the boiler sheet by opening the circuit of the magnet coil and the device moved to i the next rivet and fastened to the sheet in the same manner as before explained.

Instead of connecting the abutment member 23 rigidly with the arm 21 of the hand lever, said arm may be provided with an opening 24 extending through the same and a plunger 25 located in said opening and fitted with an abutment member 233-411 spring 26 being located within said opening and hearing at one end against the plunger 25 and at the other end against a plug 27 which closes the end of the opening 24.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is:

1. The combination with a magnet frame and a post projecting upwardly therefrom, of a lever, an abutment member for a rivet carried by an intermediate portion of said lever, said lever having a hole near one end for the passage of said post, a member mounted to rock on said lever and having a hole for the passage of said post, a cap on said post, and a spring between said cap and the member which is mounted to rock on said lever.

2. The combination with a magnet frame and a coil therein, of a core within said frame and comprising a plurality of rela tively movable parts, a lever loosely connected with said frame, and an abutment device for a rivet, carried by saidlever. p

3. The combination with a magnet frame and a coil carriedthereby, of a core movable in said frame, arms pivoted to said frame and terminating beyond the lower end thereof, a lever loosely connected with said frame, and an abutment member for a rivet carried by said lever;

In testimony whereof, I have signed this specification in the presence of a subscribing witness.

ETHA N I. nonns. Witness EDWIN S. RYCE. 

